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Business Segment Information - Summarized Financial Information of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Total revenues $ 368,659 $ 305,498 $ 1,090,556 $ 808,384  
Operating income (loss) 134,103 150,862 629,728 382,265  
Other income (expense) 63,968 (62,648) (98,065) (106,170)  
Income (loss) before income taxes 198,071 88,214 531,663 276,095  
Total assets 5,457,475   5,457,475   4,711,924
Exploration and Production [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 344,706 286,952 1,030,735 770,445  
Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 87,223 57,116 198,077 124,266  
Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 13,624 7,597 36,455 19,451  
Operating Segments [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 368,659 305,498 1,090,556 808,384  
Operating income (loss) 134,103 150,862 629,728 382,265  
Other income (expense) 63,968 (62,648) (98,065) (106,170)  
Income (loss) before income taxes 198,071 88,214 531,663 276,095  
Total assets 5,457,475   5,457,475   4,711,924
Operating Segments [Member] | Exploration and Production [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 344,706 286,952 1,030,735 770,445  
Operating income (loss) 126,184 140,765 602,797 359,121  
Other income (expense) 63,968 (62,628) (98,140) (106,159)  
Income (loss) before income taxes 190,152 78,137 504,657 252,962  
Total assets 5,344,775   5,344,775   4,592,140
Operating Segments [Member] | Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 20,925 17,090 51,630 34,266  
Operating income (loss) 23,388 19,094 53,137 39,513  
Other income (expense) 0 (20) 75 (11)  
Income (loss) before income taxes 23,388 19,074 53,212 39,502  
Total assets 212,131   212,131   78,359
Operating Segments [Member] | Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 3,028 1,456 8,191 3,673  
Operating income (loss) 5,126 4,394 15,854 11,790  
Income (loss) before income taxes 5,126 4,394 15,854 11,790  
Total assets 157,209   157,209   117,641
Intersegment Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Total revenues (76,894) (46,167) (174,711) (105,778)  
Operating income (loss) (20,595) (13,391) (42,060) (28,159)  
Income (loss) before income taxes (20,595) (13,391) (42,060) (28,159)  
Total assets (256,640)   (256,640)   (76,216)
Segment Reconciling Items [Member] | Well Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues 66,298 40,026 146,447 90,000  
Segment Reconciling Items [Member] | Midstream Services [Member]
          
Segment Reporting Information [Line Items]          
Total revenues $ 10,596 $ 6,141 $ 28,264 $ 15,778